Wang, Lichun
Xiao, Chaoxing
Chen, Lei
Zhang, Xiaofei
Kou, Qiuye http://orcid.org/0000-0001-9690-4319
Article History
Received: 18 December 2018
Accepted: 26 April 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: The medical study was approved by the Institutional Ethics Committee of the Six Affiliated Hospital, Sun Yat-sen University (Approval number: 2017ZSLYEC-110). No consent was given as the study was a retrospective cohort study and the data were analyzed anonymously, causing no interference to the patients themselves. There was almost no risk for the patients in this study, so the Institutional Ethics Committee of the Six Affiliated Hospital, Sun Yat-sen University approved the waiver.
: Not applicable.
: The authors declare that they have no competing interests.
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